The withdrawal forces of a single fiber from parallel fiber bundles were measured with the torsion balance method. The experiments were carried out on four sliverlike bundles: crimped, regular, direct roller cutting viscose rayon, and cotton fiber.
Each bundle was 1_??_2cm in length, and wrapped in cellophane tube having various diameters. Withdrawal force measured in this experiment corresponds to frictional force acting on a single fiber in a bundle which is streched by external force. The mean frictional withdrawal force of a single fiber from a bundle is affected by the fullness of the bundle (1-ε), mutual distance
d (mm) of withdrawal fibers in cross-section of the bundle, and numbers of fibers N which are drawn together.
The following results were obtained:
(1) When a single fiber is drawn out of a bundle, the frictional force
Fs (mg/cm) increases proportionally to the increase of the fullness of the bundle (1-ε). (Fig. 4.2)
(2) When two strips of single fiber are drawn out together from the bunbles whose fullness remain constant, the withdrawal force is affected by the mutual cross-sectional distance
d of withdrawal fibers; especially in the case of close contact of two fibers (
d=0), value of
Fs is equal to the withdrawal force of a single fiber from the same bundle, and as the distance of two withdrawal fibers are appart from each other in such a way that other fibers come between them, the value of
Fs approaches twice that of a single fiber (Fig. 4.3).
(3) The experiment shows that simultaneous withdrawal force
Fs of many fibers increases linearly to the increase of withdrawal fibers number
N, remainning (1-ε) and mutual distance (
d>0) constant. (Fig. 4.4).
The streching phenomena of fiber bundles, the effects of variation of (1-ε),
d and
N on the withdrawal force
Fs of single fibre are the fundamental properties will be discussed in the paper to follow.
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